linux-kernel - Re: [PATCH] random / hw_random: core: start hwrng kthread also for untrusted sources

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Date:   Wed, 7 Sep 2022 14:34:01 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Dominik Brodowski <linux@...inikbrodowski.net>
Cc:     linux-kernel@...r.kernel.org, Jason@...c4.com,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH] random / hw_random: core: start hwrng kthread also for
 untrusted sources

Dominik Brodowski <linux@...inikbrodowski.net> wrote:
>
> diff --git a/drivers/char/random.c b/drivers/char/random.c
> index 79d7d4e4e582..b360ed4ece03 100644
> --- a/drivers/char/random.c
> +++ b/drivers/char/random.c
> @@ -867,9 +867,9 @@ void add_hwgenerator_randomness(const void *buf, size_t len, size_t entropy)
> 
>        /*
>         * Throttle writing to once every CRNG_RESEED_INTERVAL, unless
> -        * we're not yet initialized.
> +        * we're not yet initialized or this source isn't trusted.
>         */
> -       if (!kthread_should_stop() && crng_ready())
> +       if (!kthread_should_stop() && (crng_ready() || !entropy))
>                schedule_timeout_interruptible(CRNG_RESEED_INTERVAL);
> }
> EXPORT_SYMBOL_GPL(add_hwgenerator_randomness);

Couldn't you split this bit out?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt